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4. T. Klinger, C. Baylard, C.D. Beidler, J. Boscary, H.S. Bosch, A. Dinklage, D. Hartmann, P. Helander, H. Maßberg, A. Peacock, T.S. Pedersen, T. Rummel, F. Schauer, L. Wegener, R. Wolf, Fusion Eng. Des. 88, 461 (2013)
5. In May 2011, a casual request concerning such a gyrotron source was considered by Communications and Power Industries, the same scientists under a different banner, with the estimate that it could be done for ~$2/W. Subsequently, when funding disappeared, CPI work at 170 GHz stalled, but a prototype 1-MW source has been demonstrated for short pulses and has run at ~340 kW for long pulses. Kevin Felch, private communications